Eckie Posted June 24, 2009 Share Posted June 24, 2009 Recently installed new lights on my trailer, using the existing electrical harness that's on the trailer. Right side -- everything works - taillights, brakelights, blinker, side marker lights. Left side -- taillights and side marker light work. Brake and blinker light do not. Hooked up the left light blinker/brake wire to the right blinker/brake wire -- works fine. So --- problem appears to be the left-side wire. I then by-passed the wire and spliced the blinker/brake light to the 4 prong adaptor ---- still no go. Guessing that the issue must be the 4 prong connector? Can't think it could be anything else, due to process of elimination, but any takers on something I missed or should check?Thanks! Quote Link to comment Share on other sites More sharing options...
jeffreyd Posted June 24, 2009 Share Posted June 24, 2009 Take a test light and check the 4 prong connector. That way you can eliminate that step. Quote Link to comment Share on other sites More sharing options...
marine_man Posted June 25, 2009 Share Posted June 25, 2009 It sure sounds like that's the issue.. I'd start with a testlight and start tracking it down from there.marine_man Quote Link to comment Share on other sites More sharing options...
SkunkedAgain Posted June 25, 2009 Share Posted June 25, 2009 When you bypassed the trailer wire and went straight to the 4-prong connector, did you still have the light grounded?My whole thought from the beginning is that there is a grounding issue. 999 times out of 1000 times that's what it is. Usually, once I've eliminated the possibility of it being a grounding issue, it ends up being a grounding issue anyway. Quote Link to comment Share on other sites More sharing options...
Eckie Posted June 25, 2009 Author Share Posted June 25, 2009 Skunked ~Thinking back, I believe the light is/was grounded properly because I only disconnected the hot wire and ran a 20 ft bypass wire up to the connnectore, leaving the ground in place. The actual "taillight" still works -- just the blinker and brake light don't work. If however, you are right, I then think I'm better off just buying a new harness/wires -- which also seems like a fairly straight forward task. If I end up doing that -- where's a good place locally to buy trailer wiring harnesses? Quote Link to comment Share on other sites More sharing options...
SkunkedAgain Posted June 27, 2009 Share Posted June 27, 2009 You can buy them at places like Fleet Farm. When I replaced the entire wire harness on my trailer two years ago, it didn't work correctly. I eventually discovered that the ground between the flasher mounting bolts and the frame was corroded. Therefore there wasn't a good ground and the lights acted funny.Make sure that you've eliminated all grounding possibilities. Quote Link to comment Share on other sites More sharing options...
jeffreyd Posted June 27, 2009 Share Posted June 27, 2009 4 way flat molded connectors allow basic hookup for three lighting functions; right turn signal / stop light (green), left turn signal / stop light (yellow), taillight / license / side marker (brown) and a ground (white). This might help a bit. good luck Jeff [note from admin: please read forum policy before posting again. thanks!] Quote Link to comment Share on other sites More sharing options...
Sandmannd Posted June 27, 2009 Share Posted June 27, 2009 Honestly, if it was me, I would buy new wiring and redo the whole thing. I did that when I redid my wiring. Check the thread on boat wiring. I soldered all mine and it works so much better. Flawless for the last two years. Quote Link to comment Share on other sites More sharing options...
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